Annoying click when touching a couple of keys on 42S

[Dave Britten]

Thanks for all the tips. It doesn't sound like a broken membrane, but I certainly can't rule it out without opening the calculator.

For starters, I'm going to inject small amounts (0.05-0.10 mL) of distilled water around the offending keys and work it in through use to see if that cleans out whatever sticky residue might be in there. I know it's not going to be completely removed without a full immersion in distilled water, but I can live with at least washing it to someplace that doesn't interfere with the key action.